Marriott Rewards, The Ritz-Carlton Rewards and Starwood Preferred Guest have teamed up to offer a Double-Points Promotions. You will need to register (between December 15, 2016 and March 15, 2017) with each company respectively to qualify for the promotion.
Basically, you will earn 2x the points on your first 3 stays during the earning period between January 16, 2017 and April 15, 2017. A stay includes consecutive nights within the same reservation. So this is a really valuable bonus offer to will speed up the accumulation of hotel points.
Keep in mind that there is instant elite status matching and unlimited points transfer between the 3 accounts.
I am really liking all the bonus offers between the three companies due to their merger. Hope they keep it up!